There’s a billion different options for these, and weight is basically no concern since they are all stupid-light. With three moving parts (only two that actually require bearings: the wheels. The headset is just a nylon bushing), balance bikes have been extremely popular for over a decade and have helped probably thousands of kids to ride bikes early. They are on CL or your local exchange website for low $$ all the time. Paying $85 for one is a chump’s game, and paying $170 for one (MSRP, apparently) is highway robbery.
